forked from pravega/bookkeeper-operator
/
add_webhook.go
158 lines (137 loc) · 4.44 KB
/
add_webhook.go
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/**
* Copyright (c) 2019 Dell Inc., or its subsidiaries. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*/
package webhook
import (
"context"
"fmt"
"log"
"github.com/operator-framework/operator-sdk/pkg/k8sutil"
bookkeeperv1alpha1 "github.com/pravega/bookkeeper-operator/pkg/apis/bookkeeper/v1alpha1"
admissionregistrationv1beta1 "k8s.io/api/admissionregistration/v1beta1"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/types"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/client/config"
"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
"sigs.k8s.io/controller-runtime/pkg/manager"
"sigs.k8s.io/controller-runtime/pkg/webhook"
"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
"sigs.k8s.io/controller-runtime/pkg/webhook/admission/builder"
)
const (
CertDir = "/tmp"
WebhookConfigName = "bookkeeper-webhook-config"
WebhookName = "bookkeeper-webhook.pravega.io"
WebhookSvcName = "bookkeeper-webhook-svc"
)
// AddToManagerFuncs is a list of functions to add all Webhooks to the Manager
var AddToManagerFuncs []func(manager.Manager) error
func init() {
// AddToManagerFuncs is a list of functions to create Webhooks and add them to a manager.
AddToManagerFuncs = append(AddToManagerFuncs, Add)
}
// AddToManager adds all Webhooks to the Manager
func AddToManager(m manager.Manager) error {
for _, f := range AddToManagerFuncs {
if err := f(m); err != nil {
return err
}
}
return nil
}
// Create webhook server and register webhook to it
func Add(mgr manager.Manager) error {
log.Printf("Initializing webhook")
svr, err := newWebhookServer(mgr)
if err != nil {
log.Printf("Failed to create webhook server: %v", err)
return err
}
wh, err := newMutatingWebhook(mgr)
if err != nil {
log.Printf("Failed to create validating webhook: %v", err)
return err
}
svr.Register(wh)
err = addOwnerReferenceToWebhookK8sService(mgr)
if err != nil {
log.Printf("Failed to update webhook svc: %v", err)
}
return nil
}
func newMutatingWebhook(mgr manager.Manager) (*admission.Webhook, error) {
return builder.NewWebhookBuilder().
Name(WebhookName).
Mutating().
Operations(admissionregistrationv1beta1.Create, admissionregistrationv1beta1.Update).
ForType(&bookkeeperv1alpha1.BookkeeperCluster{}).
Handlers(&bookkeeperWebhookHandler{}).
WithManager(mgr).
Build()
}
func newWebhookServer(mgr manager.Manager) (*webhook.Server, error) {
namespace, err := k8sutil.GetOperatorNamespace()
if err != nil {
return nil, err
}
return webhook.NewServer(WebhookSvcName, mgr, webhook.ServerOptions{
CertDir: CertDir,
BootstrapOptions: &webhook.BootstrapOptions{
MutatingWebhookConfigName: WebhookConfigName,
Service: &webhook.Service{
Namespace: namespace,
Name: WebhookSvcName,
Selectors: map[string]string{
"component": "bookkeeper-operator",
},
},
},
})
}
func addOwnerReferenceToWebhookK8sService(mgr manager.Manager) error {
// Use non-default kube client to talk to apiserver directly since the default kube client uses cache and
// that cache is not updated quickly enough for this method to use to get the operator deployment.
cfg, err := config.GetConfig()
if err != nil {
log.Fatal(err)
}
c, _ := client.New(cfg, client.Options{Scheme: mgr.GetScheme()})
// get webhook k8s service object
svc := &corev1.Service{}
ns, err := k8sutil.GetOperatorNamespace()
if err != nil {
return err
}
nn := types.NamespacedName{Namespace: ns, Name: WebhookSvcName}
err = c.Get(context.TODO(), nn, svc)
if err != nil {
return fmt.Errorf("failed to get webhook service: %v", err)
}
// get operator deployment
name, err := k8sutil.GetOperatorName()
if err != nil {
return err
}
nn = types.NamespacedName{Namespace: ns, Name: name}
deployment := &appsv1.Deployment{}
err = c.Get(context.TODO(), nn, deployment)
if err != nil {
return fmt.Errorf("failed to get operator deployment: %v", err)
}
// add owner reference so the k8s service could be garbage collected
controllerutil.SetControllerReference(deployment, svc, mgr.GetScheme())
// update webhook k8s service
err = c.Update(context.TODO(), svc)
if err != nil {
return fmt.Errorf("failed to update webhook k8s service: %v", err)
}
return nil
}